--- vartree.py
+++ vartree.py
@@ -4574,6 +4574,43 @@
 			mode='w', encoding=_encodings['repo.content'],
 			errors='backslashreplace')
 
+
+		hashtype = self.settings.get("INTEGRITY_HASH").upper()
+		if hashtype is None:
+			hashtype = "SHA512"
+		elif hashtype != "SHA1" and hashtype != "SHA256":
+			hashtype = "SHA512"
+
+		# open CONTENTS_DIGESTS file (possibly overwriting old one) for recording
+		# Use atomic_ofstream for automatic coercion of raw bytes to
+		# unicode, in order to prevent TypeError when writing raw bytes
+		# to TextIOWrapper with python2.
+		digfile = atomic_ofstream(_unicode_encode(
+			os.path.join(self.dbtmpdir, 'CONTENTS_DIGESTS_'+hashtype),
+			encoding=_encodings['fs'], errors='strict'),
+			mode='w', encoding=_encodings['repo.content'],
+			errors='backslashreplace')
+
+		# open CONTENTS_DIGESTS file (possibly overwriting old one) for recording
+		# Use atomic_ofstream for automatic coercion of raw bytes to
+		# unicode, in order to prevent TypeError when writing raw bytes
+		# to TextIOWrapper with python2.
+		modfile = atomic_ofstream(_unicode_encode(
+			os.path.join(self.dbtmpdir, 'CONTENTS_MODES'),
+			encoding=_encodings['fs'], errors='strict'),
+			mode='w', encoding=_encodings['repo.content'],
+			errors='backslashreplace')
+
+		# open CONTENTS_DIGESTS file (possibly overwriting old one) for recording
+		# Use atomic_ofstream for automatic coercion of raw bytes to
+		# unicode, in order to prevent TypeError when writing raw bytes
+		# to TextIOWrapper with python2.
+		paxfile = atomic_ofstream(_unicode_encode(
+			os.path.join(self.dbtmpdir, 'CONTENTS_ATTRS_PAX'),
+			encoding=_encodings['fs'], errors='strict'),
+			mode='w', encoding=_encodings['repo.content'],
+			errors='backslashreplace')
+
 		# Don't bump mtimes on merge since some application require
 		# preservation of timestamps.  This means that the unmerge phase must
 		# check to see if file belongs to an installed instance in the same
@@ -4586,7 +4623,7 @@
 
 		# we do a first merge; this will recurse through all files in our srcroot but also build up a
 		# "second hand" of symlinks to merge later
-		if self.mergeme(srcroot, destroot, outfile, secondhand,
+		if self.mergeme(srcroot, destroot, outfile, digfile, modfile, paxfile, hashtype, secondhand,
 			self.settings["EPREFIX"].lstrip(os.sep), cfgfiledict, mymtime):
 			return 1
 
@@ -4598,7 +4635,7 @@
 			# couldn't get merged will be added to thirdhand.
 
 			thirdhand = []
-			if self.mergeme(srcroot, destroot, outfile, thirdhand,
+			if self.mergeme(srcroot, destroot, outfile, digfile, modfile, paxfile, hashtype, thirdhand,
 				secondhand, cfgfiledict, mymtime):
 				return 1
 
@@ -4612,7 +4649,7 @@
 
 		if len(secondhand):
 			# force merge of remaining symlinks (broken or circular; oh well)
-			if self.mergeme(srcroot, destroot, outfile, None,
+			if self.mergeme(srcroot, destroot, outfile, digfile, modfile, paxfile, hashtype, None,
 				secondhand, cfgfiledict, mymtime):
 				return 1
 
@@ -4623,6 +4660,18 @@
 		outfile.flush()
 		outfile.close()
 
+		#if we opened it, close it
+		digfile.flush()
+		digfile.close()
+
+		#if we opened it, close it
+		modfile.flush()
+		modfile.close()
+
+		#if we opened it, close it
+		paxfile.flush()
+		paxfile.close()
+
 		# write out our collection of md5sums
 		if cfgfiledict != cfgfiledict_orig:
 			cfgfiledict.pop("IGNORE", None)
@@ -4634,7 +4683,7 @@
 
 		return os.EX_OK
 
-	def mergeme(self, srcroot, destroot, outfile, secondhand, stufftomerge, cfgfiledict, thismtime):
+	def mergeme(self, srcroot, destroot, outfile, digfile, modfile, paxfile, hashtype, secondhand, stufftomerge, cfgfiledict, thismtime):
 		"""
 
 		This function handles actual merging of the package contents to the livefs.
@@ -4646,6 +4695,12 @@
 		@type destroot: String (Path)
 		@param outfile: File to log operations to
 		@type outfile: File Object
+		@param digfile: File to log digests info to
+		@type digfile: File Object
+		@param modfile: File to log mode info to
+		@type modfile: File Object
+		@param paxfile: File to log mode info to
+		@type paxfile: File Object
 		@param secondhand: A set of items to merge in pass two (usually
 		or symlinks that point to non-existing files that may get merged later)
 		@type secondhand: List
@@ -4784,6 +4839,39 @@
 				# confmem rejected this update
 				zing = "---"
 
+			digest_length = 0
+			if hashtype == "SHA1":
+				digest_length = 40
+			elif hashtype == "SHA256":
+				digest_length = 64
+			elif hashtype == "SHA512":
+				digest_length = 128
+
+			if stat.S_ISREG(mymode):
+				line_digest = portage.checksum.perform_checksum(mysrc, hashtype, 0)[0]+"\n"
+				line_mode = "mode:"+oct(mymode)[-4:]+"\n"
+
+				attrlist = xattr.list(mysrc)
+				if len(attrlist)>0:
+					for i in attrlist:
+						if i == "user.pax.flags":
+							line_attr_pax = _unicode_decode(xattr.get(mysrc, "user.pax.flags")).zfill(5)+"\n"
+				else:
+					line_attr_pax = "00000\n"
+
+			elif stat.S_ISDIR(mymode):
+				line_digest = '{num:0{width}}\n'.format(num=0, width=digest_length)
+				line_mode = "mode:"+oct(mymode)[-4:]+"\n"
+				line_attr_pax = "00000\n"
+			else: #LINK, FIFO, DEV
+				line_digest = '{num:0{width}}\n'.format(num=0, width=digest_length)
+				line_mode = "mode:"+oct(mymode)[-4:]+"\n"
+				line_attr_pax = "00000\n"
+
+			digfile.write(line_digest)
+			modfile.write(line_mode)
+			paxfile.write(line_attr_pax)
+
 			if stat.S_ISLNK(mymode):
 				# we are merging a symbolic link
 				# Pass in the symlink target in order to bypass the